JPH07171536A - Melting disposal device for waste asbestos material - Google Patents

Abstract

PURPOSE:To provide a melting disposal device for a waste asbestos material which disposes and turns the asbestos material into a harmless substance of superior volume reduction properties without adding any additional material, leaking the material to the outside, scattering and outflowing. CONSTITUTION:A closed electric melting furnace 1 is installed, and an introduction chute 11 running through a furnace cover 7 is formed, while an introduction section 17 for guiding a plastic bag B in which a waste asbestos material A is loaded is formed at the end of the introduction chute. A device for pushing the introduced bag into the introduction chute is also formed, and a chute line 15 for guiding downward the bag pushed into the introduction chute while retaining the bag is also formed, and a discharge outlet 16 is formed at the end of the introduction chute. The bag loaded with the asbestos material is pushed in and compression filled in a chute line by the arrangement, and the lumps of asbestos material running in the overlapping state in multiple stages are introduced successively from the lower end into hot melt slug and melted and turned into a harmless substance without the generation of scattering and overflowing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste asbestos material melting treatment apparatus for melting waste asbestos material containing asbestos such as waste building materials.

[0002]

2. Description of the Related Art Asbestos is composed of extremely fine fibrous substances, has a high tensile strength and is slightly inferior in acid resistance, but is excellent in alkali resistance. For this reason, asbestos has been widely used in industrial products such as building materials, disc brakes, gaskets, etc. because of its high stability.

By the way, when asbestos is discarded, its storability is a problem. Therefore, conventionally, in the treatment of such asbestos, for example, the treatment of waste asbestos materials containing asbestos such as waste building materials, asbestos is scattered outside.
It was treated so that it would not flow out, and landfilled in the landfill as it was, or it was mixed and solidified with concrete to be landfilled in the landfill.

[0004]

However, such a treatment does not make any modification to the characteristics of asbestos, which is a stable and accumulating mineral fiber, and is merely a temporary measure from the viewpoint of preventing scattering and outflow. Therefore, there is a risk that asbestos will be scattered outside if the landfill situation changes.

That is, the former treatment of simply disposing of the asbestos while keeping the characteristics and shape of asbestos and discarding it in a landfill, will destroy the treatment of scattering / spillage in the future and will be abandoned again. It is considered that the asbestos material is exposed, and in such a case, asbestos may scatter or flow out from the exposed waste asbestos material.

In the latter treatment of solidifying the concrete and discarding it in the landfill, it is conceivable that the solidified concrete may be destroyed or damaged by weathering. In such a case, the waste asbestos material is converted into asbestos. May separate and may be scattered or spilled.

Therefore, in order to solve such a problem, recently, as disclosed in Japanese Unexamined Patent Publication No. 5-138147, aluminum oxide is added to waste asbestos material to adjust its components. Has been proposed for firing ceramic products at a temperature of 1220 ° C. or higher.

[0008] Therefore, it is conceivable to use the product of waste asbestos material produced by the same method as a landfill product. However, this method requires the procurement of aluminum oxide to be added and the work of adding the additive material.

Moreover, since the amount of the product corresponding to the amount of the added aluminum oxide increases, the amount of the landfilled product increases correspondingly, which is not good. The present invention has been made in view of such circumstances, the purpose is to add asbestos, without adding any additives, and without leaking out of the device, scattering and outflow does not occur, Another object of the present invention is to provide a melt processing apparatus for waste asbestos material, which can be processed into a harmless substance excellent in volume reduction.

[0010]

In order to achieve the above object, the apparatus for melting waste asbestos material according to claim 1 is an electric machine in which a furnace body and a furnace lid are combined and the inside of the furnace is hermetically sealed. A melting furnace is provided, a charging shunt is provided through the furnace lid along the inside and outside directions of the furnace, and a plastic housing in which waste asbestos material is hermetically accommodated at the end of the charging shunt facing the outside of the furnace. A loading unit for guiding the bag to the loading shoe is provided, and a pushing device for pushing the storage bag loaded from the loading unit into the loading shoe is provided.
A shunt path for guiding the accommodation bag pushed downward by the pushing device is provided in the tray, and the accommodation bag is provided from the lower end of the shunt path to the end of the charging shunt facing the furnace. The purpose is to provide a discharge port for discharging the gas into the furnace.

In addition to the above object, the apparatus for melting waste asbestos material according to a second aspect of the present invention has a simple structure and a storage bag in which the waste asbestos material is hermetically stored is lowered in the input shunt. In order to do so, the shoot path according to claim 1,
It consists of a passage with a diameter that stops the movement of the bag by compression.

In addition to the above object, the apparatus for melting waste asbestos material according to a third aspect of the present invention includes, in addition to the above objects, a furnace for the end portion of the shunt path in order to smoothly dissolve the waste asbestos material contained in the storage bag. This is because the molten slag that has been melted inside is extended to near the surface of the molten metal, and a cooling portion for cooling the molten slag is provided at the end portion near the molten slag.

In addition to the above purpose, the apparatus for melting waste asbestos material according to claim 4 is intended to process extremely fine dust generated in the electric melting furnace without leaking out of the apparatus. In addition to the configuration described in 1, the dust collector which is connected to the electric melting furnace through a gas duct and collects the dust contained in the atmosphere in the furnace, and the dust collected by this dust collector are made of plastic. The storage bag is provided with a storage device for hermetically storing.

In addition to the above object, the apparatus for melting waste asbestos material according to a fifth aspect of the present invention includes, in addition to the above objects, a combustor in the gas duct according to the fourth aspect for processing a combustible gas generated during the melting treatment. Has been established.

In addition to the above object, the apparatus for melting waste asbestos material according to claim 6 is intended to prevent the waste asbestos material remaining in the furnace from leaking out of the apparatus when the operation is stopped. Alternatively, in the melting treatment apparatus according to claim 4, when the operation of the electric melting furnace is stopped, a means for operating the pushing device to discharge all the storage bags in the shoot path into the furnace and the electric melting in the charging section. It is provided with a lid that closes the charging port of the charging unit when the operation of the furnace is stopped.

The waste asbestos material melting treatment apparatus according to claim 7 is the same as the waste asbestos material melting treatment apparatus according to claim 1 or 4, wherein the pushing device is operated when the electric melting furnace is stopped. Means for discharging all the storage bags in the shunt path into the furnace, and means for filling the storage bag of the dummy containing the heat resistant fiber into the lower part of the shunt path when the electric melting furnace is stopped. It has been established.

[0017]

According to the apparatus for melting a waste asbestos material according to the first aspect of the present invention, the plastic containing bags in which the waste asbestos material is hermetically sealed are sequentially charged from the charging section. Since the waste asbestos material is hermetically sealed in the storage bag, it does not scatter outside during the work up to the input.

The loaded storage bags are sequentially pushed into the loading shoe by the pushing device. Here, since the shunt path of the input shunt is composed of a path for holding the storage bag, the storage bag does not fall by itself but descends while being held in the shunt path as it is pushed. .

As a result, the accommodating bags are in a multi-tiered state in the shoot path. On the other hand, the storage bag near the outlet is
The bag itself disappears due to the heat of the electric melting furnace and becomes a lump of only waste asbestos material.

This lump-shaped waste asbestos material is charged into
Is poured into the molten metal slag from the outlet of the grate. Then, the waste asbestos material is melted in the molten metal slag heated to a temperature equal to or higher than its melting point temperature in the electric melting furnace.

As a result, the waste asbestos material is melt-processed into a substance that neither scatters nor flows out. The substance thus treated is excellent in volume reduction because no additives are added.

Further, during the melting process, since the accommodating bags themselves, which are stacked in multiple stages, serve as a lid in the charging shoot, fine dust and dirt existing in the furnace will not leak out of the apparatus. As a result,
Harmful asbestos is processed into a substance that does not leak out of the device at all, has no risk of being scattered or flowing out, and is excellent in volume reduction.

According to the apparatus for melting waste asbestos material of the second aspect, the storage bag in which the waste asbestos material is hermetically stored is compressed in its entirety according to the pushing of the pushing device, and is sequentially compressed to the shoot path. , Pushed in.

As a result, the storage bag is
Due to the elasticity of the waste asbestos material, it is brought into contact with the wall surface and held in the passage by friction, that is, held so that the movement stops.

This means that a shoe having a predetermined passage diameter is used.
Due to the configuration using only the tongue, the storage bag in which the waste asbestos material is hermetically stored is lowered while being overlapped with each other according to the above-mentioned pushing in the input shunt.

According to the apparatus for melting waste asbestos material of the third aspect, the temperature rise due to the molten slag is suppressed by the cooling portion provided at the end portion of the shunt path near the molten slag, and the waste is stored. The asbestos material is prevented from melting and disappearing near the outlet.

As a result, the waste asbestos material in the shoot path is submerged in the molten metal slag from a position near the molten metal slag surface. As a result, the waste asbestos material can be melted by the molten metal slag without forming a bridge.

According to the apparatus for melting waste asbestos material of claim 4, the extremely fine dust generated in the electric melting furnace during the melting processing of the waste asbestos material according to claim 1 is gas duct. Through, it is guided to the dust collector and collected.

The collected dust is hermetically stored in a plastic storage bag in the storage device. The bag containing the soot and dust can be treated again by putting it in the feeding section again.

As a result, it becomes possible to perform the melting treatment of the waste asbestos material without leaking any substance containing harmful asbestos to the outside of the apparatus. According to the apparatus for melting waste asbestos material described in claim 5, the combustible hydrocarbons and other combustible gases generated by the gasification of the plastic bag are combusted by the combustor before reaching the dust collector. It becomes harmless carbon dioxide and water vapor.

As a result, not only asbestos and dust, but also combustible gas generated during the melting process is processed. According to the apparatus for melting waste asbestos material according to claim 6, when the operation is stopped, the charging port of the charging section is closed,
By operating the pushing device, all the storage bags in the shoot path are discharged into the furnace.

As a result, even if the operation is stopped, the waste asbestos material, dust and gas remaining in the furnace will not leak out of the apparatus. According to the waste asbestos material melting treatment apparatus of the seventh aspect, when the operation is stopped, all the storage bags in the shoot path are discharged into the furnace by the operation of the pushing apparatus.

Then, instead of the conventional storage bag containing the waste asbestos material, a dummy storage bag containing heat-resistant fibers is filled in the lower part of the shoot path. As a result, the shunt path is sealed by filling the bag containing the dummy, so that the waste asbestos material, dust and soot remaining in the furnace even when the operation is stopped, as in the case of claim 6, No gas leaks out of the equipment. Moreover, the shunt path is protected from heat damage because it is shielded from the heat from the molten metal slag and the high temperature atmosphere by the heat shielding by the dummy bag.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the first embodiment shown in FIGS. FIG. 1 shows the entire melting processing apparatus for waste asbestos material to which the present invention is applied.
Is an electric melting furnace, for example, an electric resistance melting furnace (hereinafter, simply referred to as a melting furnace), and 2 is a furnace body.

As shown in FIG. 2, the furnace body 2 comprises a furnace wall 3 made of, for example, a graphite refractory inside a furnace shell 3 to form a furnace wall 4 and a furnace bottom 5. Further, a cooling jacket 6 is provided on the outer peripheral surface of the furnace shell 3 along the circumferential direction and is equal to or higher than the melting point temperature of the waste asbestos material A, for example, 1500.
It is designed to withstand a high temperature of ℃.

Further, a furnace lid 7 is provided at the upper opening of the furnace body 2 so as to close the opening, thereby sealing the inside of the furnace.
The furnace lid 7 is provided with an alumina-based amorphous refractory 8 on its inner surface. Further, a cooling jacket 7a is provided on the outer surface of the furnace lid 7 so as to withstand a high temperature of 1500 ° C. as in the case of the furnace body 2.

The furnace lid 7 is provided with a carbon electrode, that is, a graphite electrode 9, penetrating through the furnace lid 7. The graphite electrode 9 is held by an electrode lifting device (not shown) having an electrode gripping device so as to be lifted and lowered.

Further, the furnace lid 7 is provided with a waste asbestos material charging device 10 (hereinafter simply referred to as a charging device 10). The object to be charged from the charging device 10 is a required size in which a waste asbestos material A containing asbestos such as a waste building material is hermetically stored in a double plastic storage bag B of a predetermined size. Alternatively, the soot and dust C generated during processing may be hermetically sealed in a double-sized plastic storage bag B having a required size and may have a required size.

The charging device 10 will be described below.
Reference numeral 1 denotes a charging shoe provided so as to penetrate the furnace lid 7. The charging shunt 11 has one end supported by the furnace lid 7 through the refractory 12 and the other end extending upward, and has a closed upper end and an open lower end. A cooling jacket 13 (corresponding to a cooling portion) is formed on the entire peripheral wall portion, which is connected to the side shoe 11a and the lower end of the upper side shot body 11a and extends downward (inside the furnace) from the lower end. It has a cylindrical lower side shoe 11b.

The shunt passage 15 is formed by utilizing the passage 15a formed by the inner cavity portions of the lower side shunt 11a and the lower side shunt 11b arranged in series. The lower end of the shunt path 15 extends to the vicinity of the molten metal slag surface due to the extension of the lower shunt 11b. The lower end of the shunt passage 15 communicates with the discharge port 16 at the lower end of the lower shunt 11b that opens toward the molten metal slag surface.

A charging section 17 is provided at the end of the upper side shunt 11a facing the outside of the furnace. As shown in FIG. 2, the charging part 17 has a charging duct 18 which is connected to the peripheral wall of the upper side shunt 11a. The charging duct 18 projects in the horizontal direction and has an end closed.

Further, the upper wall portion at the longitudinal center of the charging duct 18 is provided with a charging port 19 having a larger opening than the accommodating bag B containing the waste asbestos material A and the accommodating bag D containing the soot and dust C. Has been. As a result, the storage bag B containing the waste asbestos material A and the storage bag D containing the dust C from the input port 19 into the input duct 18 are provided.
So that it can be put in.

The input port 19 is provided with a rotatable lid 20 for opening and closing the input port 19. The lid 20 is used so as to be opened at all times during operation and closed at rest such as when operation is stopped, and at the time of rest, the charging port 19 is closed so as not to leak.

A passage 18a formed by the charging duct 18
Is composed of an inner cavity having an inner diameter larger than the outer shapes of the storage bag B containing the waste asbestos material A and the storage bag D containing the dust C.

At the end of the passage 18, an input pusher -21 which can be moved back and forth along the passage 18a is accommodated.
The closing pusher -21 is connected to a hydraulic cylinder device 23 as a drive source, for example, via an advancing / retreating shaft 22 penetrating the end of the duct.

The hydraulic cylinder device 23 has a function of stroking between the inlet position X _{1 of the} upper side shoe 11a shown by the chain double-dashed line in FIG. 2 and the standby position X ₂ of the passage end shown by the solid line. have.

The storage bag B or the storage bag D inserted from the input port 19 by the stroke of the hydraulic cylinder device 23 is passed through the input duct 18 to the shunt path 1.
It can be pushed into the entrance of No. 5.

[0048] The upper end of the upper duct 11a, pushing the pusher -24 a retractable toward the inlet position X ₁ side is accommodated. The push-in pusher 24 is connected to a hydraulic cylinder device 26 (which constitutes a push-in device together with the hydraulic cylinder device 26) as a drive source, for example, via an advancing / retreating shaft 25 penetrating the end of the duct.

The hydraulic cylinder device 26 has a pushing position Y ₁ which is set to be the same as the lower surface position of the passage 18a, which is indicated by the chain double-dashed line in FIG. 2, and a standby position Y ₂ which is indicated by the solid line at the end of the duct.
It has the function of stroking between and.

By the stroke movement of the hydraulic cylinder device 26, the accommodation bag B or the accommodation bag D pushed into the inlet of the upper side shoe 11a can be pushed into the short path 15.

Here, the shunt passage 15 is formed of a passage 15a having an inner diameter considerably smaller than the outer shapes of the storage bag B containing the waste asbestos material A and the storage bag D containing the soot and dust C. Specifically, in the passage 15a, the accommodation bag B and the accommodation bag D do not naturally fall in the shunt passage 15 as they are, but are compressed by the pushing of the pushing pusher 24 and proceed to the shunt passage 15, and the pushing passage It has an inner diameter that allows it to stay in the closed position.

Each of the hydraulic cylinder devices 23 and 26 is connected via a cylinder drive device 27 to a control unit 28 composed of, for example, a microcomputer. Further, the control unit 28 is connected to an operation unit 28a having, for example, a closing switch and a pause switch (neither is shown).

When the closing switch is operated, the control unit 28 is set so that the closing pusher 21 and the pushing pusher 24, which are on standby, are sequentially moved to the entrance position X ₁ and the pushing position Y ₁ . .

With this setting, the accommodation bag B and the accommodation bag D, which have been inserted from the insertion port 19, sequentially overlap each other in the shunt path 15 and intermittently each time the pushing pusher 24 is stroked. To descend.

Cooling jacket 1 of the input shunt 11
3 is connected with the cooling jackets 6 and 7a of the melting furnace 1 to the cooling device 30 via the circulation paths 29a and 29b. Note that 31a and 31b are the circulation paths 29, respectively.
The circulating pump inserted in a and 29b is shown.

Thus, the melting furnace 1 withstands the high temperature of 1500 ° C. by supplying the cooling fluid cooled by the cooling device 30 to the cooling jackets 6 and 7a. Further, by supplying the cooling fluid cooled by the cooling device 30 to the cooling jacket 13, the waste asbestos material A and the soot and dust C that have been put in.
Until sent to a position as close as possible to the outlet 16,
It does not melt and disappear.

When the pause switch is operated, the control unit 28 waits for the pusher pusher -21.
Is set to move to a resting push-in position Y ₃ which is set on the end side of the shoot path 15 as shown in FIG. -All of the storage bags B and D remaining in the flow path 15 can be put into the furnace.

On the other hand, a gas duct 32 is communicatively connected to the furnace lid 7. The end portion of the gas duct 32 extends outside the furnace as shown in FIG. 1 so as to guide the exhaust gas (atmosphere) inside the furnace to the outside of the furnace. This gas duct 32
Is connected to a dust collector 33 installed outside the furnace.

The dust collector 33 is composed of a coarse particle dust collector 33a and a fine particle dust collector 33b connected in series. The outlet of the dust collector 33b for fine particles has a suction fan 34
Is connected to the suction unit of the suction fan 34, and the exhaust gas in the furnace is guided to the coarse particle dust collectors 33a and the fine particle dust collectors 33b by suction of the suction fan 34.

That is, in each of the coarse particle dust collector 33a and the fine particle dust collector 33b, the dust C contained in the exhaust gas is contained.
Are removed. A secondary combustion torch 32a is provided in the gas duct 32 as a device for burning the combustible gas flowing in the gas duct 32.

Reference numeral 35 denotes a chimney connected to the discharge part of the suction fan 34. In addition, each dust collector 33a, 33
In b, storage devices 36a and 36b for packing the collected dust C into the storage bag D are provided.

Each of the accommodating devices 36a, 36b has, for example, hoppers 37a, 37b for collecting the dust C at the outlet formed at the bottom of the dust collectors 33a, 33b. The outlets of the hoppers 37a and 37b have, for example, screw feeders 38a and 38b as unloading devices for unloading the dust C. The hopper 37a and the screw feeder 38a provided on the coarse particle dust collector 33a are for coarse particles, and the hopper 37b and the screw feeder 38b provided on the fine particle dust collector 33b are for fine particles.

Further, the motors 39a and 39b as the driving units for driving the screw feeders 38a and 38b for the coarse particles and the fine particles, respectively, have an operating unit 40a for turning on and off the motors 39a and 39b, respectively. 40b is provided.

Screw screws for coarse particles and fine particles
The mouths 41a and 41b to which the mouth of the accommodation bag D can be attached are provided at the outlets of the das 38a and 38b. Further, on each of the mouths 41a and 41b, a switch that is opened and closed by the operation portions 40a and 40b, for example, a structure in which a plate-shaped valve body slides between a closed position and an open / closed position of the mouths 41a and 41b. Sealing valves 42a and 42b are provided.

As a result, the accommodating devices 36a and 36b are
In both cases, by mounting the mouth portion of the accommodation bag D on the mouth bodies 41a and 41b and turning on the operation portions 40a and 40b,
The screw feeders 38a and 38b are operated, and the sealing valve 42 is used.
The a and 42b are opened to allow the soot and dust C (coarse particles and fine particles) in the hoppers 37a and 37b to be packed into a bag. Further, by turning off the operation portions 40a and 40b, the screw feeders 38a and 38b are stopped and the sealing valves 42a and 42b are closed to prevent the dust C from leaking to the surroundings.

The storage bag C in which this dust C is packed is also
By introducing the waste asbestos material A, the dust C is also melt-processed together with the waste asbestos material A.

Although not shown, the furnace body 2 of the melting furnace 1 is provided with a tapping slag discharge port for taking out the melted material to the outside. Next, the operation of the melt processing apparatus configured as described above will be described.

First, the melting furnace 1 is operated to generate the molten metal slag 43 in the furnace. This is performed by, for example, charging carbon powder as a high-temperature heat source and a raw material as a molten slag source into the melting furnace 1 and energizing the graphite electrode 9.

As a result, the raw material serving as the molten slag source is melted, and a predetermined molten metal slag 43 is generated in the furnace. While operating in this way, around the input part 17,
The waste asbestos material A packed in the double plastic storage bag B for processing is transported from the site (the place where the waste asbestos material is generated).

At this time, since the waste asbestos material A is hermetically stored in the storage bag B, the asbestos of the waste asbestos material A, which is harmful, does not scatter or flow out to the outside during transportation.

Then, the processing operation of the waste asbestos material A is started. At this time, as shown in FIG. 3 (a), the lid 20 is opened, the above-mentioned storage bags B are inserted one by one, and the closing switch of the operation unit 28 is operated for each loading operation.

Then, first, the hydraulic cylinder device 23 is actuated, and as shown in FIG. 3 (b), the closing pusher -21 at the standby position X ₂ is stroked to the entrance position X ₁ and thrown in. The storage bag B containing the waste asbestos material A is pushed into the inlet portion of the upper side shoe 11a through the charging duct 18.

Then, the hydraulic cylinder device 26 operates,
As shown in FIG. 3 (c), from the state in which the input pusher -21 is in the inlet position X ₁ , the push pusher 24 in the standby position Y ₂ strokes to the push position Y ₁ and The accommodation bag B pushed into the portion is pushed into the shoot path 15 while being compressed.

Here, the passage 15a of the short path 15 is
Since the accommodation bag B containing the waste asbestos material A that has been pushed in is set to have an inner diameter such that it stays at that position, it will stop at the point where it has been pushed in by the pushing pusher 24.

When the pushing is completed, the pushing pusher 24 and the pushing pusher 21 are returned to the original standby position X.
Return to ₂ , Y ₂ . Such a loading process is repeated as the storage bags B are loaded one by one.

Then, in the shunt path 15, the storage bag B containing the waste asbestos material A compressed as shown in FIG.
Are piled up in multiple stages to be filled. As a result, the accommodation bag B in the shoot path 15 is pushed into the pusher pusher-2.
Every time 4 operates, it descends intermittently, and the lowest containing bag B gradually approaches the discharge port 16.

Then, the lower plastic containing bag B reaches the high temperature point of the charging shunt 11, and the plastic bag itself receives the heat of the molten metal slag 43 and softens. After melting and melting, it gasifies (decomposes) and disappears.

As a result, only the waste asbestos material A clogged in a lump is formed in the lower layer. Here, the cooling jacket 13
A cooled cooling fluid is circulated through the charging shunt 1
Since the outlet 16 side of No. 1 is cooled, the massive waste asbestos material A does not melt and disappear due to the suppression of the temperature rise by the molten metal slag 43, and the point close to the outlet 16 as it is (lower side shoot). 14).

Next, this massive waste asbestos material A is
As the push-in pusher 24 is pushed down, it is extruded into the furnace through the discharge port 16 located near the molten metal slag surface.

By such indentation, the waste asbestos material A
Is smoothly pushed into the molten metal slag 43 without forming a bridge. Then, most of the waste asbestos material A in the lump is submerged in the molten metal slag 43 heated to the melting point temperature of the waste asbestos material A or higher.

Here, since the submerged waste asbestos material A has good wettability with the molten metal slag 43, heat is rapidly exchanged with the molten metal slag 43 to rapidly dissolve it.
Further, a part of the waste asbestos material A is dispersed on the molten metal slag surface around the discharge port 16. This waste asbestos material A
Melts from the portion in contact with the molten slag 43 while covering the molten slag surface of the entire surface of the furnace as the molten metal flows outward from the periphery of the electrode.

As a result, the waste asbestos material A is efficiently dissolved. At the same time, the layer of the waste asbestos material A that covers the molten metal slag surface by diffusion blocks the radiant heat from the molten metal slag surface and protects the refractories of the furnace body 2 and the furnace lid 7. Further, the layer of the waste asbestos material A functions to collect most of the heavy metal oxides and the like that volatilize from the molten slag surface and return it to the molten slag.

In this way, the waste asbestos material A is melt-processed into a harmless substance which does not scatter or flow out. Further, the substance melt-processed in this way is excellent in volume reduction because no additives are added.

Further, during the melting process, the accommodating bag B containing the waste asbestos material A, which is stacked in multiple stages, seals in the charging shunt 11 as a lid, so that the fine dust and debris existing in the furnace is removed. It never leaks out.

In other words, the melting process in the melting furnace 1 reduces the volume of harmful asbestos without adding any additives and without leaking to the outside air and without fear of scattering or outflow. It is processed into an excellent harmless substance.

Then, the same material may be taken out from the furnace and finally landfilled as a landfilled material or reused. On the other hand, in the furnace, gases (combustible hydrocarbons and other combustible gases generated due to the disappearance of the plastic bag) and extremely fine dust C are generated due to the melting process of the waste asbestos A.

Here, since soot and dust C contains some asbestos, treatment must be considered. Therefore, the dust collecting system and the containing system are used to process the dust C.

That is, the suction fan 34 operates according to the operation of the melting furnace 1. As a result, the gas and dust C generated in the furnace are sucked in from the gas duct 32. Then, while passing through the gas duct 32, the combustible gas such as combustible hydrocarbons generated by the gasification of the bag is combusted by the operating secondary combustion torch 32a.

By this process, the combustible gas is removed as harmless carbon dioxide gas and water vapor in the preceding stage of the dust collectors 33a and 33b. The remaining dust C is the gas duct 32.
Through the dust collector 33a for coarse particles.

Then, when the dust collector 33a passes through, the coarse particle dust collector 33a collects the dust C of coarse particles. Further, the particulate dust C passing through the coarse particle dust collector 33a is guided to the fine particle dust collector 33a in the subsequent stage,
When passing through the dust collector 33b, the particulate dust collector 33a collects the particulate dust C.

The dust C collected by the dust collectors 33a and 33b is accumulated in hoppers 37a and 37b provided under the dust collectors 33a and 33b, respectively. Then,
The dust C in each of the hoppers 37a and 37b is sealed in a bag by an operator.

That is, on the coarse particle side, the mouth portion of the double plastic bag D is screwed into the screw feeder 38.
It is attached to the mouth 41a of a and the operation unit 40a is turned on. Then, the sealing valve 42a opens to open the mouth 41a. Further, the screw feeder 38a starts the conveying operation.

As a result, the coarse particle dust C accumulated in the hopper 37a is accommodated in the accommodating bag D. And, if a certain amount of soot and dust C is stored,
The operation unit 40b is turned off.

Then, the sealing valve 42b closes and the mouth 4
1b is closed and hermetically closed, and the screw feeder 38b stops the conveying operation and shuts off the dust collecting system and the containing system from the outside air.

This prevents the dust C from scattering in the environment. After the coarse particles of dust C are stored in the storage bag D, the mouth of the storage bag D is hermetically closed to store the dust C in a sealed state.

On the fine particle side, the dust D of the fine particles is hermetically accommodated in the double plastic accommodation bag D by the same operation. Each of the so-packed coarse particles and fine particles of dust C is charged from the charging port 19 together with the packed waste asbestos material A, and the waste asbestos material A is melted and rendered harmless as in the case of the waste asbestos material A.

The amount of the soot and dust C to be added is determined according to the ratio obtained from the melting treatment amount of the melting furnace 1, and the good operation is maintained. That is, it can be seen from experiments and the like that the amount of the soot and dust C generated is a percentage of the total amount of coarse particles and fine particles with respect to the waste asbestos material A to be melt-processed. The bulk specific gravity of dust C is almost the same as that of waste asbestos material A.

From this, the amount of soot and dust C to be processed can be known.
That is, it is possible to know how much of the bag containing dust C should be added to the number of bags containing waste asbestos material A to be melted (the amount of waste asbestos material A and the amount of collected dust). Ratio that almost matches the ratio).

For example, the number of bags containing waste asbestos material A,
A bag containing coarse particles and fine particles of dust C may be introduced into the 200 bags at a rate of one bag from the introduction port 19.
Then, the soot and dust C is softened, melted, and vaporized while descending the shunt path 15, and is sandwiched in the waste asbestos material in a sandwich shape, and a part of the molten metal is adsorbed or trapped in the waste asbestos material A. Pushed into the slag,
It dissolves without generating dust. In addition, the dust C that is not adsorbed or trapped in the waste asbestos material A and tries to come out in the form of fine powder is also the waste asbestos material A that covers the surface of the molten slag.
It gradually dissolves in the state of being trapped in the layer.

As a result, the waste asbestos A can be melted without leaking any harmful asbestos-containing substance to the outside of the processing apparatus. Of course, the plastic sheet for scattering prevention used in the place where the waste asbestos material A is removed (the asbestos adheres to this as it scatters around the site to prevent scattering of asbestos).
May be stored in the storage bag B and subjected to the melting process. in this case,
The size of the plastic sheet may be properly folded and the like, and the plastic sheet may be put in a bag together with the waste asbestos material A.

On the other hand, it is not preferable that the unmelted waste asbestos material A remains in the furnace when the operation is stopped due to the periodic inspection or repair of the melting furnace 1. Therefore, at this time, the loading of the accommodation bags B and D is stopped and the inside of the loading duct 18 is emptied, and then the loading port 19 is closed with the lid 20 as shown by the chain double-dashed line in FIG. 2 and the solid line in FIG. Then, the pause switch of the operation unit 28 is operated.

Then, by the operation of the hydraulic cylinder device 26, as shown in FIG. 4, the push-in pusher 24 strokes to the push-in position Y ₃ and all of the shoot path 15 is filled. Waste asbestos material A is molten metal slag 43
Be thrown into.

As a result, all the remaining waste asbestos material A
Is melt processed. At this time, since the inside of the furnace is kept airtight by the lid 20, the waste asbestos material A, the dust C, and the gas remaining in the furnace do not leak to the outside.

As a result, the operation is stopped without the waste asbestos material A, the dust C, and the gas being scattered or flowing out to the external environment. FIG. 5 shows a second embodiment of the present invention.

In this embodiment, in addition to the above-mentioned leakage prevention at the time of operation stoppage, the molten slag surface is exposed (generated by the waste asbestos material A floating on the surface of the molten slag 43 being gradually melted). -Measures for suppressing the heat damage to G11 are taken.

That is, in the present embodiment, instead of the waste asbestos material A filled in the shunt passage 15, a dummy bag is filled. Specifically, in advance in a storage bag E made of heat resistant fiber, for example, ceramic fiber,
Similarly, a heat-resistant fiber F-filled storage bag B containing the waste asbestos material A of the first embodiment or a dummy bag replacing the storage bag D is prepared.

Further, a second closing switch (not shown) is set in the operating portion 28a. When the second closing switch is operated, the control unit 28 causes the closing pusher-2.
After the operation of No. 1, the pusher pusher is pushed from the standby position Y ₁ to the dummy set position Y ₄ set at the lower part of the shoot path 15.
The function to move 24 is set.

As a result, when the operation is stopped, the pushing pusher 24 is moved to the pushing position Y ₃ (shown in FIG. 4) and remains in the shunt path 15 as in the first embodiment. All the storage bags C and D containing the waste asbestos material A and the soot and dust C that are being used are put into the molten metal slag.

Then, as shown in FIG. 5, the containing bag E (dummy bag) containing the heat-resistant fiber F is immediately inserted into the inlet 19.
Then, the second closing switch is operated. Then, the loaded storage bag E (damage bag) is moved as shown in FIG. 5 by the movement of the above-mentioned pusher pusher 21 and the stroke movement of the pusher pusher 24 to the damee set position Y ₄ . It is pushed to the bottom of the shoot path 15.

Then, the containing bag E containing the heat-resistant fiber is filled in the lower part of the charging shoe 11. As a result, the lower part of the charging shoe 11 is shielded and heat-shielded by the accommodation bag E containing the heat-resistant fiber.

In this way, the residual waste asbestos material A
It is also possible to prevent damage to the input shunt 11 during the melting of. When the operation is started again, the filling is heat resistant fiber,
If the storage bag E is melt-processed as it is together with the storage bag B containing the waste asbestos A that is thrown in later, the waste asbestos material A is melted as it is without affecting the melt processing.

Of course, instead of one bag, a plurality of dummy bags may be filled in the lower part of the shoe path 15. By doing so, the effect is further enhanced. However, in the second embodiment, the same parts as those in the first embodiment and the description of the same parts will be described with reference to FIG. 2 and the same reference numerals will be given, and the description thereof will be omitted.

The heat shield structure described in the second embodiment may be combined with the airtight structure of the lid 20 described in the first embodiment. In this case, after the shoot path 15 is thermally shielded with a dummy bag, the charging port 19 is closed with the lid 20.

The present invention may be applied to a melting furnace having a plurality of electrodes, or another type of electric melting furnace may be used. Further, a plurality of charging shunt structures may be provided in the melting furnace instead of a set of charging shunt structures so that a large amount of waste asbestos material A can be efficiently melted. For example, in a melting furnace having three electrodes, it is conceivable to provide a total of three charging shunt structures, one set between each electrode.

[0115]

As described above, according to the invention described in claim 1, asbestos is not added with any additive and does not leak to the outside of the apparatus to prevent scattering and outflow and to reduce the volume. It can be processed into excellent harmless substances.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the inside of the closing shoe is constructed with a simple structure.
The storage bag in which the waste asbestos material is hermetically stored can be lowered as desired.

According to the invention of claim 3, in addition to the effect of claim 2, the waste asbestos material can be dissolved in the molten metal slag without forming a bridge, and the waste asbestos material can be smoothed. It can be dissolved.

According to the invention of claim 4, in addition to the effect of claim 1, extremely fine dust generated in the electric melting furnace can be treated without leaking out of the apparatus, and The waste asbestos material can be melted without leaking substances containing harmful asbestos to the outside of the apparatus.

According to the invention described in claim 5, in addition to the effect of claim 4, the combustible gas generated during the melting process can be processed into harmless carbon dioxide gas and steam.
According to the invention of claim 6, in addition to the effect of claim 1 or claim 4, it is possible to prevent the waste asbestos material remaining in the furnace from leaking out of the apparatus when the operation is stopped.

According to the invention of claim 7, in addition to the effect of claim 1 or claim 4, it is possible to prevent the waste asbestos material remaining in the furnace from leaking out of the apparatus when the operation is stopped. In addition, it is possible to protect the shunt passage from heat from the molten metal slag and a high temperature atmosphere by heat shielding with a dummy bag.

[Brief description of drawings]

FIG. 1 is a diagram showing a melting treatment apparatus for waste asbestos material according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an electric melting furnace constituting the melting processing apparatus.

FIG. 3 is a cross-sectional view for explaining a step in which waste asbestos material is compressed and filled in a shunt path and is charged into a furnace.

FIG. 4 is a cross-sectional view for explaining a process in which all of the waste asbestos material filled in the shoot path is put into the furnace when the operation is stopped.

FIG. 5 is a sectional view showing a main part of a second embodiment of the present invention.

[Explanation of symbols]

1 ... Electric melting furnace 2 ... Furnace body
7 ... Furnace lid 9 ... Electrode 11 ... Input shunt 13 ... Cooling jacket (cooling part)
15 ... Shoot path 16 ... Discharge port 17 ... Input section
19 ... Input port 21 ... Input pusher 23, 26 ... Hydraulic cylinder device 24 ... Pushing pusher 32 ... Gas duct 3
2a ... Combustion torch 33a ... Dust collector for coarse particles 33b ... Dust collector for fine particles 34 ... Suction fans 36a, 36b ... Housing devices 37a, 37b ... Hoppers 38a, 38b ... Screw feeders 41a, 41b ... Mouth 42a, 42b ... Sealing valve A ... Waste asbestos C ... Dust
E ... Heat-resistant fiber bag B, D ... Plastic bag F ... Heat-resistant fiber

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F23G 7/00 ZAB E

Claims (7)

[Claims] 1. An electric melting furnace in which a furnace body and a furnace lid are combined and the inside of the furnace is hermetically sealed; An input part provided at an end of the input shoot that faces the outside of the furnace, for introducing a plastic storage bag in which the waste asbestos material is hermetically stored to the input shoot, and the input that is input from the input part. Put the bag into the
And a passage for holding the storage bag in the closing shoe formed in the closing shoe, and a downward direction while holding the storage bag pressed by the pressing device. And a discharge port that is provided at an end of the charging shoot that faces the inside of the furnace and that discharges the storage bag from the lower end of the shoot path into the furnace. Characteristic melting asbestos material melting equipment. 2. The apparatus for melting waste asbestos material according to claim 1, wherein the shunt path is constituted by a passage having a passage diameter defined to stop the movement of the accommodating bag by compression. . 3. The shunt path extends to near the molten metal slag melted in the furnace, and a cooling portion for cooling the molten slag is provided at an end portion near the molten slag. The melting and processing apparatus for waste asbestos material according to claim 2, wherein 4. An electric melting furnace in which a furnace body and a furnace lid are combined and the inside of the furnace is hermetically sealed, and a charging shunt provided through the furnace lid along the inside and outside directions of the furnace. An input part provided at an end of the input shoot that faces the outside of the furnace, for introducing a plastic storage bag in which the waste asbestos material is hermetically stored to the input shoot, and the input that is input from the input part. Put the bag into the
And a passage for holding the storage bag in the closing shoe formed in the closing shoe, and a downward direction while holding the storage bag pressed by the pressing device. To the electric melting furnace, a discharge path that leads to the electric melting furnace, a discharge port that is provided at an end of the charging shunt that faces the inside of the furnace, and that discharges the storage bag from the lower end of the shunt path into the furnace. A dust collecting device for collecting the dust contained in the atmosphere in the furnace, and a containing device provided in the dust collecting device for sealingly containing the collected dust in a plastic containing bag. An apparatus for melting waste asbestos material, which is characterized by being equipped. 5. The apparatus for melting waste asbestos material according to claim 4, wherein a combustion device for burning a combustible gas is provided in the gas duct. 6. The apparatus for melting waste asbestos material according to claim 1 or 4, wherein when the operation of the electric melting furnace is stopped, the pushing device is operated to fully store the material in the shoot path. Means for discharging the bag into the furnace, and provided in the charging part, when the operation of the electric melting furnace is stopped,
An apparatus for melting waste asbestos material, comprising: a lid that closes an input port of the input unit. 7. The apparatus for melting waste asbestos according to claim 1 or 4, wherein when the operation of the electric melting furnace is stopped, the pushing device is operated to fully accommodate the material in the shunt path. And a means for discharging the bag into the furnace, and a means for filling a bag containing a dummy containing heat-resistant fiber into the lower part of the shunt path when the electric melting furnace is stopped. Equipment for melting waste asbestos materials.